Improvement in tiltlng-chairs



c. F. SPENCER.

Tilting-Chair. N0.-160, 2 PatentedMarch9,l875.

THE GRAPH I000. PHOTO rLlTH-SQ ll 4] PARK PLAOEJi-Y.

UNITED STATES PATENT OFFICE.

CHARLES FwSPENO/ER, OF CLEVELAND, OHIO.

IMPROVEMENT IN TlLTlNG-CHAIRS.

Specification forming part of Letters Patent No. 160,624, dated March 9,1875; application filed February 26, 1875.

To all whom it may concern:

Be it known that 1, CHARLES F. SPENoER. of Cleveland, in the county ofOuyahoga and State of Ohio, have invented certain newand usefulImprovements in Tilting- Chairs, of which the following is aspecification:

This invention relates to certain improvements in that class of chairswhich have a revolving and tilting motion; and the invention consistsoftwo arched frames secured to the bottom of the seat at each sidethereof, to which is adapted rollers journaled to a small frame or blockloosely connected with the legs of the chair, so as to revolve on thesame, whereby the seat of the chair has a rocking motion by means of thearched frame traversing the rollers, as will be hereinafter more fullydescribed.

In the accompanying drawings, Figure 1 represents a side elevation of achair with my invention applied thereto. Fig. 2 is a perspective view ofthe roller-frame and arched frame.

The seat and back of the chair may be of any desired pattern or style,and to the under side of the seat, at or near its sides, is secure: lyattached two arched frames or supports, A A, having flanges a at theirends, provided with openings for the passage of screws for holding themin position. The arched frames are each provided with an arc shaped orcurved slot extending nearly the entire distance of the frames, and insaid slots are adapted to work rollers b b, which are journaled tovertical arms at or near the side corners of a rectangular or squareblock or frame, B, mounted on the leg-frame O of the chair. In thepresent instance the upper end of the leg-frame is provided with acylindrical tenon, 0, adapted. to a central circular opening or aperturein the roller-frame, for allowing the latter to revolve on the tenon togive the revolving or rotary motion to the chairseat; but it is evidentthat the roller-frame may be provided with the usual screw-threadedshank adapted to a screw-threaded socket passing through the leg-frame.

By the construction above specified, I provide a chair which has an easyand comfortable rocking or tilting motion, and capable of revolving,rendering it very desirable as an/- office-chair.

It will be seen that the arched frame traverses the rollers, and thatwhen the chair is being used it may be inclined forward to accommodate aperson when reaching forward to procure an article, say, for instance,at his desk; and, further, the seat can be inclined forward or backward,as shown in the full lines and dotted lines, or retained in a horizontalposition, as the occupant may desire.

Instead of providing the arched frame with an arc-shaped or curved slot,I design casting the same in a solid piece, possessing the arched orcurved shape, and journal to the block or frame B, at each side of thesame, three rollers, b, in such a manner that one of said rollers shalltraverse the upper surface of the arched frame, and the remaining twoshall traverse its under surface, thus practically accomplishing theresult before mentioned; and, further, it is evident that, instead ofthe journaled rollers, the frame B could be provided'with projectionswhich would answer the same purpose as the rollers.

I am enabled by the above construction to dispense with all springs forgiving a tilting motion to the chair, which are very liable to break,and require frequent renewal; and, further, provide a tilting-chair, thestructure of which possesses great strength and durability.

I claim as 1ny'invention The frame B, having the vertical arms providedwith rollers b, in combination with the frames A, having the curvedslots in which the rollers operate, and the flanges a for securing themto the chair-seat, substantially as and for the purpose described.

In testimony that I claim the foregoing I have hereunto set my hand.

. CHAS. F. SPENCER.

Witnesses:

JAMES L. NORRIS, A. H. Noimrs.

